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In previous studies, we have reported that double perovskiteLa NiMnO (LNMO) presents a non-negligible potential for room temperature magnetocaloric tasks. With the aim of improving even further the cooling performances and the working temperature range of double perovskites, we report the magnetic and magnetocaloric properties of La MnFeO and related compounds. The partial substitution of strontium for lanthanum enables us to cover a wide operating temperature range with significant magnetic entropy change extending beyond 300 K. For some optimal growth conditions, the entropy change varies slowly over an unusually large temperature range, which is of clear interest from a practical point of view.